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Switchover mechanism for a reversible control valve of a...

Tool driving or impacting – Passage in manipulating handle for drive motor motive fluid – Motive fluid control valve in handle passage
Reexamination Certificate

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Synchronized hydraulic hammer arrangement

Tool driving or impacting – Power paths to plural tools from single drive – Drive plural means to reciprocate hammer heads or tools
Patent

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Synchronous vibratory impact hammer

Tool driving or impacting – Drive by means reacting to rotating eccentric mass
Patent

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System and method for communicating over power terminals in...

Tool driving or impacting – Processes
Reexamination Certificate

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System and method for setting up ski course gates

Tool driving or impacting – Means to drive tool about an axis – Gear drive
Patent

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System for controlling a rock drill

Tool driving or impacting – Processes
Patent

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System for controlling drilling force of a telescoping rock dril

Tool driving or impacting – Processes
Patent

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System for lubricating and reciprocating a piston in a fluid-act

Tool driving or impacting – Work cleansing – By motive fluid for drive motor or advance causing or...
Patent

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System for lubricating and reciprocating a piston in a fluid-act

Tool driving or impacting – Work cleansing – By motive fluid for drive motor or advance causing or...
Patent

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System for lubricating and reciprocating a piston in a fluid-act

Tool driving or impacting – Work cleansing – By motive fluid for drive motor or advance causing or...
Patent

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System for mounting a pile driver

Tool driving or impacting – Processes
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